Arcane help

I switched to arcane after the fire nerfs so im still pretty new to it. I was wondering which i should be, mastery or haste. I cant post my armory link but if you search on the US armory for Frósbty (alt code for the ó is alt 0243). if thats too much my stats are 61.60% mastery 15.01% hit, 13.32% haste, 13.53% crit, 29,160 Spell Power. thanks.

I find that Mastery performs better on dummys but in a raid setting where there are other contributing factors to your dps, such as mobility, Haste really shines. I just cant get used to all those slow ass AB casts.